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Vulnerability record · CVE-2026-100070 · published 25 September 2026

CVE-2026-100070: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?

5.5 CVSS 3.1 Medium EPSS 0.11% · top 98.5%
5.5CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
20 Oct 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46 Patch
https://git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690 Patch
https://git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122 Patch
https://git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140 Patch
https://git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465 Patch
https://git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2 Patch
https://git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee Patch
https://git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-100070), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.